TITLE: GCN CIRCULAR NUMBER: 16798 SUBJECT: GRB 140907A: Fermi GBM Detection DATE: 14/09/08 15:32:05 GMT FROM: Binbin Zhang at UAH Bin-Bin Zhang (UAH) reports on behalf of the Fermi GBM Team: "At 16:07:11.80 UT on 07 September 2014, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 140907A (trigger 431798834 / 140907672), which was also detected by the Swift/BAT (Krimm et al 2014, GCN 16788) The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight is 16 degrees. The GBM light curve consists of a single pulse with multiple peaks. The total duration (T90) is about 35 +/- 10 s (50-300 keV). The time-averaged spectrum from T0-12 s to T0+22 s is best fit by a power law function with an exponential high-energy cutoff.  The power law index is -0.97 +/- 0.08  and the cutoff energy, parameterized as Epeak, is 113 +/- 7 keV. The event fluence (10-1000 keV) in this time interval is (5.5 +/- 0.2)E-06 erg/cm^2. The 1.024-sec peak photon flux measured starting from T0+8.9 s in the 10-1000 keV band is 4.2 +/- 0.3  ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."